CN109644112B

CN109644112B - Operating method for a communication node for transmitting system information in a communication network

Info

Publication number: CN109644112B
Application number: CN201780052884.7A
Authority: CN
Inventors: 李正薰; 金玟贤; 金志炯; 金哲淳; 文盛铉; 朴柱昊; 李濬焕
Original assignee: Electronics and Telecommunications Research Institute ETRI
Current assignee: Electronics and Telecommunications Research Institute ETRI
Priority date: 2016-12-22
Filing date: 2017-12-21
Publication date: 2021-08-31
Anticipated expiration: 2037-12-21
Also published as: EP3562079A4; JP6924819B2; KR102531880B1; US20190306889A1; US11044758B2; JP2019528642A; EP3562079A1; CN109644112A; EP3562079B1; KR20180073467A

Abstract

A method of operation of a communication node for transmitting system information in a communication network is disclosed. An operation method of a communication node for transmitting system information in a communication network according to one embodiment of the present invention is an operation method of a base station for transmitting system information in a communication network, and includes the steps of: configuring information on a request time when system information is requested and a transmission time when the system information is transmitted in a communication network; transmitting a message including configured information on a request time and a transmission time by using a broadcast-based method; receiving a message requesting system information from at least one user equipment included in a communication network based on a request time; and transmitting a message including system information to the at least one user equipment based on the transmission time.

Description

Operating method for a communication node for transmitting system information in a communication network

Technical Field

The present invention relates to an operating method of a communication node for transmitting system information in a communication network, and more particularly, to an operating method of a communication node for transmitting system information according to a request for system information in a communication network.

Background

In a communication network, a terminal (e.g., user equipment) may typically transmit and receive data via a base station. For example, when there is data to be transmitted to the second terminal, the first terminal may generate a message containing the data to be transmitted to the second terminal, and may transmit the generated message to the first base station to which it belongs. The first base station may receive a message from the first terminal and recognize that the received message is destined for the second terminal. The first base station may send a message to a second base station to which the second terminal as the identified destination belongs. The second base station may receive the message from the first base station and recognize that the destination of the received message is the second terminal. The second base station may transmit the message to the second terminal as the identified destination. The second terminal may receive a message from the second base station and obtain data contained in the received message.

Meanwhile, in a communication network, a terminal may obtain downlink-related information (e.g., frequency, time synchronization, cell ID, etc.) based on a synchronization signal periodically transmitted from a base station. Then, the terminal may establish a radio link with the base station and acquire system information transmitted from the base station via the established radio link. Then, the terminal can access the base station by performing an access procedure for the base station based on the acquired system information.

As described above, the system information transmitted from the base station may be periodically transmitted regardless of the request of the terminal. That is, in a communication network, a base station periodically transmits system information without a request for the system information. Therefore, the base station in the communication network may unnecessarily transmit system information, thereby failing to efficiently use radio resources.

Disclosure of Invention

[ problem ] to provide a method for producing a semiconductor device

The present invention is directed to a method of operating a communication node for transmitting system information according to a request for the system information in a communication network.

[ technical solution ] A

In order to achieve the above object, an operating method of a base station for transmitting system information in a communication network according to an embodiment of the present invention may include: configuring information on a request time of system information and a transmission time of the system information in a communication network; transmitting a message including information on a request time of system information and a transmission time of the system information in a broadcast manner; receiving a message requesting system information from at least one terminal included in a communication network based on a request time; and transmitting a message including system information to the at least one terminal included in the communication network based on the transmission time.

Here, the information on the request time may include information on a time point at which the system information can be requested.

Here, the time point at which the system information can be requested may be one of a first time point at which the system information is previously configured to be requested at the at least one terminal and a second time point at which the at least one terminal can perform uplink transmission.

Here, a message requesting system information may be received from at least one terminal at a time point when the system information can be requested.

Here, the information on the transmission time may include one of information on a time point at which the system information is transmitted from the base station and information on at least one time period during which the system information is transmitted.

Here, the time point of transmitting the system information may be one of a first time point after a predetermined time from the time point of receiving the message requesting the system information and a second time point configured in advance for periodically transmitting the system information.

Here, when the message including the system information is transmitted in at least one period, the message including the system information may be transmitted based on a plurality of redundancy versions in the at least one period.

In order to achieve the above object, an operating method of a base station for transmitting system information in a communication network according to another embodiment of the present invention may include: receiving a message requesting system information from a plurality of groups, each of the plurality of groups including at least one terminal in a communication network; configuring parameters for transmission of system information for each of the plurality of groups; and transmitting a message including system information for the plurality of groups based on the configured parameter.

Here, the message requesting the system information may be transmitted based on a RACH preamble, which is a resource pre-configured by the base station for requesting the system information.

Here, the configured parameters may include a transmission time of the system information and an identifier used to transmit the system information.

Here, in the configuring of the parameters, the transmission time and the identifier for the first system information for a first group included in the plurality of groups and the second system information for a second group included in the plurality of groups may be configured such that the first system information and the second system information are distinguished from each other.

Here, in the configuring of the parameter, when the transmission time for the first system information and the transmission time for the second system information are configured to be identical to each other, the identifier for the first system information and the identifier for the second system information may be configured to be different from each other.

Here, in the configuring of the parameter, when a transmission time for the first system information and a transmission time for the second system information are configured to be different from each other, the identifier for the first system information and the identifier for the second system information may be configured to be the same as each other.

In order to achieve the above object, an operating method of a terminal for receiving system information in a communication network according to still another embodiment of the present invention may include: receiving a message including information on a request time of system information and a transmission time of the system information from a base station; transmitting a message requesting system information to the base station based on the request time; and receiving a message including system information from the base station based on the transmission time.

Here, the time point of transmitting the system information may be one of a first time point after a predetermined time from a time point of receiving a message requesting the system information at the base station and a second time point configured in advance for periodically transmitting the system information from the base station.

Here, the message including the system information may be received based on one of a time point at which the system information is transmitted and at least one time period during which the system information is transmitted, which are included in the information on the transmission time.

Here, when the message including the system information is received in the at least one period, the message including the system information may be received based on a plurality of redundancy versions in the at least one period.

[ PROBLEMS ] the present invention

According to the present invention, a communication node serving as a base station in a communication network can efficiently use radio resources by transmitting system information only when the system information is needed.

Drawings

Fig. 1 is a conceptual diagram illustrating a first embodiment of a communication system;

fig. 2 is a block diagram showing a first embodiment of a communication node constituting a communication system;

FIG. 3 is a conceptual diagram illustrating an embodiment of a type 1 frame;

FIG. 4 is a conceptual diagram illustrating an embodiment of a type 2 frame;

fig. 5 is a flowchart illustrating a method of operation of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 6 is a conceptual diagram illustrating a first embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 7 is a conceptual diagram illustrating a second embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 8 is a conceptual diagram illustrating a third embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 9 is a conceptual diagram illustrating a fourth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 10 is a conceptual diagram illustrating a fifth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 11 is a conceptual diagram illustrating a sixth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention;

fig. 12 is a flowchart illustrating an operation method of a communication node for transmitting system information in a communication network according to another embodiment of the present invention; and

fig. 13 is a conceptual diagram illustrating an operation method of a communication node for transmitting system information in a communication network according to another embodiment of the present invention.

Detailed Description

While the invention is susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described in detail herein. It should be understood, however, that the description is not intended to limit the invention to the particular embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Although the terms "first," "second," etc. may be used herein with respect to various elements, these elements should not be construed as limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. To facilitate a thorough understanding of the present invention, like reference numerals refer to like elements throughout the description of the drawings, and the description of like components will not be repeated.

Fig. 1 is a conceptual diagram illustrating a first embodiment of a communication system.

Referring to fig. 1, a communication network 100 may include a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. The communication network 100 may also be referred to herein as a 'communication system'. Each of the plurality of communication nodes may support at least one communication protocol. For example, each of the plurality of communication nodes may support at least one of the following communication protocols: a communication protocol based on Code Division Multiple Access (CDMA), a communication protocol based on wideband CDMA (wcdma), a communication protocol based on Time Division Multiple Access (TDMA), a communication protocol based on Frequency Division Multiple Access (FDMA), a communication protocol based on Orthogonal Frequency Division Multiplexing (OFDM), a communication protocol based on Orthogonal Frequency Division Multiple Access (OFDMA), a communication protocol based on single carrier FDMA (SC-FDMA), a communication protocol based on non-orthogonal multiple access (NOMA), and a communication protocol based on Space Division Multiple Access (SDMA). Each of the plurality of communication nodes may have the following structure.

Fig. 2 is a block diagram illustrating a first embodiment of a communication node constituting a cellular communication system.

Referring to fig. 2, the communication node 200 may include a transceiver 230 connected to a network to perform communication, a memory 220, and at least one processor 210. Further, the communication node 200 may also include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each of the components included in the communication node 200 may communicate with each other as connected via a bus 270.

The processor 210 may execute programs stored in at least one of the memory 220 and the storage device 260. Processor 210 may refer to a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), or a special-purpose processor on which to perform methods according to embodiments of the present disclosure. Each of the memory 220 and the storage 260 may be constituted by at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a Read Only Memory (ROM) and a Random Access Memory (RAM).

Referring again to fig. 1, communication system 100 may include a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and a plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. Each of the first, second, and third base stations 110-1, 110-2, and 110-3 may form a macro cell (micro cell), and each of the fourth and fifth base stations 120-1 and 120-2 may form a small cell (small cell). The fourth base station 120-1, the third terminal 130-3 and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. In addition, the second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. Further, the fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. Further, the first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1, and the sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may refer to a node B, an evolved node B (enb), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, an access point, an access node, and so on. Further, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 may refer to a User Equipment (UE), a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, and the like.

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in the same frequency band or different frequency bands. The plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other via an ideal backhaul (backhaul) or a non-ideal backhaul, and exchange information with each other via the ideal backhaul or the non-ideal backhaul. Further, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network via an ideal or non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may transmit a signal received from the core network to a corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 and transmit a signal received from the corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 to the core network.

Further, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may support multiple-input multiple-output (MIMO) transmission (e.g., single-user MIMO (SU-MIMO), multi-user MIMO (MU-MIMO), massive MIMO, etc.), coordinated multipoint (CoMP) transmission, Carrier Aggregation (CA) transmission, transmission in an unlicensed band, device-to-device (D2D, device-to-device) communication (or proximity-service), etc. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 may perform an operation corresponding to the operation of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 (i.e., the operation supported by the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2). For example, the second base station 110-2 may transmit signals to the fourth terminal 130-4 in a SU-MIMO manner, and the fourth terminal 130-4 may receive signals from the second base station 110-2 in a SU-MIMO manner. Alternatively, the second base station 110-2 may transmit signals to the fourth terminal 130-4 and the fifth terminal 130-5 in a MU-MIMO manner, and the fourth terminal 130-4 and the fifth terminal 130-5 may receive signals from the second base station 110-2 in a MU-MIMO manner.

The first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit signals to the fourth terminal 130-4 in a CoMP transmission manner, and the fourth terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 in a CoMP manner. Further, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may exchange signals with the corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 belonging to its cell coverage in a CA manner. Each of the base stations 110-1, 110-2, and 110-3 may control D2D communication between the fourth terminal 130-4 and the fifth terminal 130-5, and thus the fourth terminal 130-4 and the fifth terminal 130-5 may perform D2D communication under the control of the second base station 110-2 and the third base station 110-3.

Meanwhile, the communication network may support a Frequency Division Duplex (FDD) mode, a Time Division Duplex (TDD) mode, and the like. The frame based on the FDD mode may be defined as a 'type 1 frame', and the frame based on the TDD mode may be defined as a 'type 2 frame'.

Fig. 3 is a conceptual diagram illustrating an embodiment of a type 1 frame.

Referring to fig. 3, a radio frame (radio frame)300 may include 10 subframes, and a subframe may include 2 slots. Thus, radio frame 300 may include 20 slots (e.g., slot #0, slot #1, slot #2, slot #3,. the., slot #18, and slot # 19). Length (T) of radio frame 300_f) May be 10 milliseconds (ms). The length of the subframe may be 1ms, and the length of the slot (T)_slot) May be 0.5 ms. Here, T_sMay be 1/30,720,000 s.

A slot may be composed of a plurality of OFDM symbols in the time domain and may be composed of a plurality of Resource Blocks (RBs) in the frequency domain. The RB may be composed of a plurality of subcarriers in the frequency domain. The number of OFDM symbols constituting a slot may vary depending on the configuration of a Cyclic Prefix (CP). The CP may be classified into a normal CP and an extended CP. If a normal CP is used, a slot may consist of 7 OFDM symbols, in which case a subframe may consist of 14 OFDM symbols. If extended CP is used, a slot may consist of 6 OFDM symbols, in which case a subframe may consist of 12 OFDM symbols.

Fig. 4 is a conceptual diagram illustrating an embodiment of a type 2 frame.

Referring to fig. 4, a radio frame 400 may include two half frames (half frames), and a half frame may include 5 subframes. Thus, the radio frame 400 may include 10 subframes. Length (T) of radio frame 400_f) May be 10 ms. The length of a field may be 5 ms. The length of the subframe may be 1 ms. Here, T_sMay be 1/30,720,000 s.

The radio frame 400 may include at least one downlink subframe (downlink subframe), at least one uplink subframe (uplink subframe), and at least one specific subframe. Each of the downlink subframe and the uplink subframe may include two slots. Length of time slot T_slotMay be 0.5 ms. Among subframes included in the radio frame 400, each of the subframe #1 and the subframe #6 may be a specific subframe. The specific subframe may include a downlink pilot time slot (DwPTS), a Guard Period (GP), and an uplink pilot time slot (UpPTS).

The downlink pilot slot may be regarded as a downlink interval (downlink interval) and may be used for time and frequency synchronization acquisition of the terminal, cell search, and the like. The guard period may be used to solve the interference problem of uplink data transmission caused by the delay of downlink data reception. Further, the guard period may include time required for switching from a downlink data receiving operation to an uplink data transmitting operation. The uplink pilot time slot may be used for uplink channel estimation, time and frequency synchronization acquisition, and the like.

The lengths of the downlink pilot time slot, the guard period, and the uplink pilot time slot included in a specific subframe may be variably adjusted as needed. In addition, the number and position of each of the downlink subframe, the uplink subframe, and the specific subframe included in the radio frame 400 may be changed as needed.

Fig. 5 is a flowchart illustrating an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 5, a communication network according to an embodiment of the present invention may refer to a New Radio (NR) communication system. The NR communication system may be a communication system supporting communication at frequencies below 6GHz and above 6 GHz. As described above, the operation method for transmitting system information in a communication network according to an embodiment of the present invention may be performed in a base station. That is, a communication node transmitting system information in a communication network according to an embodiment of the present invention may refer to a base station.

First, the base station may configure information on a system information request time and a system information transmission time in the communication network (S100). Here, the information on the system information request time may include information on a system information requestable time point at which at least one terminal included in the communication network can request the system information. For example, the system information requestable time point may be one of a first time point preconfigured in the base station for requesting the system information at the at least one terminal and a second time point at which the at least one terminal can perform uplink transmission (uplink transmission).

Further, the system information transmission time may include one of the following information: information on a point in time when the requested system information is transmitted by the base station, and information on at least one period of time (which may also be referred to as a 'time window') during which the requested system information is transmitted by the base station. For example, the time point of transmitting the system information may be one of a first time point after a predetermined time from the reception of the message requesting the system information and a second time point pre-configured at the base station for periodically transmitting the system information. Further, the at least one period during which the system information is transmitted may be a single period or a plurality of periods. Here, in the case where the at least one period is configured to be a plurality of periods, the plurality of periods may be configured periodically or aperiodically.

Thereafter, the base station may transmit a message including information on a system information request time and a system information transmission time in a broadcast manner (S200). Specifically, the base station may generate a message comprising: information on a system information request time point at which at least one terminal included in the communication network can request system information, and information on a transmission time at which the base station transmits the system information. Then, the base station may transmit a message including information on a system information request time and information on a system information transmission time in a broadcast manner.

For example, the message including the information on the system information request time and the information on the system information transmission time may be a message including minimum system information (i.e., minimum SI) necessary for at least one terminal included in the communication network. That is, the information on the system information request time and the information on the system information transmission time may be periodically transmitted as being included in the minimum SI transmitted by the base station. Also, the information on the system information request time and the information on the system information transmission time may be transmitted as being included in the information configuring the RRC parameter for the at least one terminal.

Accordingly, at least one terminal included in the communication network may receive a message including information on a system information request time and information on a system information transmission time, which are transmitted from the base station in a broadcast manner. Then, at least one terminal included in the communication network may transmit a message requesting system information to the base station based on the system information request time. Specifically, the at least one terminal may identify a system information requestable time point from the information on the system information request time. Thereafter, at least one terminal may transmit a message requesting system information to the base station based on the identified time point.

That is, in the case where a time point indicated by the information on the system information request time is a first time point (i.e., a time point pre-configured in the base station for requesting system information at the at least one terminal), the at least one terminal may transmit a message requesting system information at the first time point. On the other hand, in the case where the time point indicated by the information on the request time is a second time point (i.e., a time point at which the at least one terminal can perform uplink transmission), the at least one terminal may transmit a message requesting system information at the second time point.

Here, the message requesting system information transmitted from at least one terminal included in the communication network may be in the form of a Scheduling Request (SR) message, RACH preamble (preamble), or the like transmitted by the at least one terminal. Alternatively, the message requesting system information transmitted from the at least one terminal may be a separate message generated for requesting system information. For example, when a message requesting system information transmitted from at least one terminal is transmitted based on a RACH preamble, the RACH preamble may be a contention-free RACH preamble.

Then, the base station may receive a message requesting system information based on the system information request time from at least one terminal (S300). That is, the message requesting system information received at the base station may be received at one of a first time point and a second time point indicated by the information regarding the system information request time.

Then, the base station may transmit a message including the system information to at least one terminal based on the system information transmission time (S400). Specifically, in case that the system information transmission time is configured as a time point at which the system information is transmitted, the base station may transmit a message including the requested system information to at least one terminal at one of the first time point and the second time point.

On the other hand, in the case where the system information transmission time is configured as at least one period during which the system information is transmitted, the base station may transmit a message including the system information to the at least one terminal in the configured at least one period. In this case, the base station may transmit a message including the requested system information to the at least one terminal based on the plurality of redundancy versions in the at least one period.

Accordingly, at least one terminal may receive a message including system information from a base station based on a system information transmission time. That is, the message including the system information may be received at a time point or at least one time period indicated by the system information transmission time. Specifically, at least one terminal may perform monitoring for reception of system information at a time point or at least one period indicated by a system information transmission time. For example, at least one terminal may monitor a system information-RNTI (SI-RNTI) of a Physical Downlink Control Channel (PDCCH) from a base station.

For example, in case that the system information transmission time indicates at least one period, the at least one terminal may receive a message including the system information in the at least one period indicated by the system information transmission time. In this case, the at least one terminal may receive the message including the system information based on the plurality of redundancy versions for the at least one period of time.

Meanwhile, in the communication network according to the embodiment of the present invention described with reference to fig. 5, the base station transmitting the system information is described as configuring the system information request time as the first time point or the second time point (i.e., the time point at which at least one terminal can perform uplink transmission). However, the base station may not explicitly configure the system information request time as the first time point or the second time point.

In this case, the base station may configure only information on the system information transmission time in step S100, and may transmit a message including only information on the system information transmission time in a broadcast manner in step S200. Therefore, at least one terminal may not obtain information on the system information request time. In this case, at least one terminal may transmit a message requesting system information to the base station at a time point when the at least one terminal can perform uplink transmission, which is the same as the second time point described with reference to fig. 5.

Hereinafter, a plurality of embodiments (first to sixth embodiments) of an operation method of a communication node for transmitting system information in a communication network according to the embodiment of the present invention described with reference to fig. 5 will be specifically described with reference to fig. 6 to 11.

Fig. 6 is a conceptual diagram illustrating a first embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 6, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information, and a plurality of terminals 621 to 627. The plurality of terminals may include a first terminal 621, a second terminal 622, a third terminal 623, a fourth terminal 624, a fifth terminal 625, a sixth terminal 626 and a seventh terminal 627. The base station 610 and the plurality of terminals 621 to 627 included in the communication network may refer to the base station and the terminals described with reference to fig. 1, and may have a structure similar to or the same as that of the communication node described with reference to fig. 2.

First, in a communication network, a plurality of terminals 621 to 627 may generate a message requesting system information and transmit the message requesting system information to the base station 610. Specifically, each of the plurality of terminals 621 to 627 may transmit a message requesting system information to the base station 610 at a point in time when each of the plurality of terminals 621 to 627 can perform uplink transmission. That is, the message requesting system information is transmitted at a time point at which each of the plurality of terminals can perform uplink transmission, which may mean that the system information requestable time point is not configured in advance, or that the time point at which each of the plurality of terminals can perform uplink transmission is configured as the system information requestable time point.

Accordingly, the base station 610 may receive a message requesting system information from each of the plurality of terminals 621 to 627 at a point of time when each of the plurality of terminals 621 to 627 can perform uplink transmission. Then, the base station 610 may transmit a message including the system information to each terminal at a time point after a predetermined time from the reception of the message requesting the system information. That is, the message including the system information is transmitted at a time point after a predetermined time from the reception of the message requesting the system information, which may mean that the time point at which the system information is transmitted is configured as a first time point corresponding to the system information transmission time described with reference to fig. 5.

For example, the base station 610 may receive a message requesting system information from the first terminal 621 at a first time point. Then, the base station 610 may transmit a message including system information to the first terminal 621 at a second time point after a predetermined time from the first time point at which the first terminal 621 receives the message requesting system information. Further, the base station 610 may receive a message requesting system information from the second terminal 622 at a third point in time. Then, the base station 610 may transmit a message including the system information to the second terminal 622 at a fourth time point after a predetermined time from the third time point at which the second terminal 622 receives the message requesting the system information. In the manner described above, the base station 610 may transmit a message including system information to each of the plurality of terminals 621 to 627.

Fig. 7 is a conceptual diagram illustrating a second embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 7, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information, and a plurality of terminals 621 to 627, as described with reference to fig. 6. First, each of a plurality of terminals 621 to 627 included in a communication network may generate a message requesting system information and transmit the message requesting system information to the base station 610. Specifically, each of the plurality of terminals 621 to 627 may transmit a message requesting system information to the base station 610 at a time point when each of the plurality of terminals 621 to 627 can perform uplink transmission. That is, the message requesting system information is transmitted at a time point at which each of the plurality of terminals can perform uplink transmission, which may mean that the system information requestable time point is not configured in advance, or that the time point at which each of the plurality of terminals can perform uplink transmission is configured as the system information requestable time point, as described with reference to fig. 6.

Accordingly, the base station 610 may receive a message requesting system information from each of the plurality of terminals 621 to 627 at a point of time when each of the plurality of terminals 621 to 627 can perform uplink transmission. Then, the base station 610 may transmit a message including the system information to each terminal at a time point that is a time point previously configured as a time point of transmitting the system information. That is, the message including the system information is transmitted at a time point that is a time point previously configured to transmit the system information, which may mean that the time point at which the system information is transmitted is configured as a second time point corresponding to the system information transmission time described with reference to fig. 5.

For example, each of the first terminal 621, the second terminal 622, and the third terminal 623 may generate a message requesting system information, and transmit the message to the base station 610 at a time point when each of the first terminal 621, the second terminal 622, and the third terminal 623 can perform uplink transmission. Accordingly, the base station 610 may sequentially receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 at a point in time when the first terminal 621, the second terminal 622, and the third terminal 623 are able to perform uplink transmission, respectively. Then, the base station 610 may transmit a message including the system information to the first terminal 621, the second terminal 622, and the third terminal 622 at a pre-configured time point when a predetermined time for transmitting the system information has elapsed.

Then, each of the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 may generate a message requesting system information and transmit the message to the base station 610 at a time point when each of the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 can perform uplink transmission. Accordingly, the base station 610 may sequentially receive messages requesting system information from the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 at a point of time when the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 can perform uplink transmission. Then, the base station 610 may transmit a message including the system information to the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 at a pre-configured point of time when a predetermined time for transmitting the system information has elapsed. In the above manner, the base station 610 may transmit a message including system information to each of the plurality of terminals 621 to 627.

Fig. 8 is a conceptual diagram illustrating a third embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 8, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information, and a first group 620-1 and a second group 620-2, each of the first group 620-1 and the second group 620-2 being composed of at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to fig. 6 and 7. In addition, the second group 620-2 may include a fourth terminal 624, a fifth terminal 625, a sixth terminal 626 and a seventh terminal 627 as described with reference to fig. 6 and 7.

First, each of the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may generate a message requesting system information and transmit the message requesting system information to the base station 610 at a time point pre-configured as a system information requestable time point. That is, the message requesting system information is transmitted at a preconfigured time point, which may mean that the system information requestable time point is configured in advance by the base station 610, and that information on the preconfigured time point is obtained from the base station 610.

Accordingly, the base station 610 may receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point pre-configured as a system information requestable time point. Then, the base station 610 may generate a message including the system information and transmit the message to the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point preconfigured as a transmission time point of the system information.

In the above manner, the base station 610 may receive a message requesting system information from the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 included in the second group 620-2 at a time point preconfigured as a system information requestable time point. Then, the base station 610 may transmit a message including the system information to the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 included in the second group 620-2 at a time point preconfigured as a transmission time point of the system information.

Fig. 9 is a conceptual diagram illustrating a fourth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 9, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information and a first group 620-1 consisting of at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to fig. 6 and 7.

Accordingly, the base station 610 may receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point pre-configured as a system information requestable time point. Then, the base station 610 may generate a message including the system information and transmit the message to the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 in a time period pre-configured as a time period during which the system information is transmitted (a case where a single time period is configured is shown in fig. 9).

Specifically, the time period during which the system information is transmitted by the base station 610 may be a predetermined time period from a point in time when a message requesting the system information has been received from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1. Here, the base station 610 may transmit a message including system information at any point in a period during which the system information is transmitted.

However, if the downlink resource for transmitting the message including the system information is not secure, the base station 610 may transmit the message including the system information at a point of time when the downlink resource for transmitting the message is secure during a period of time during which the system information is transmitted. That is, a time point at which system information is actually transmitted at the base station 610 may indicate a time point at which downlink resources are safe.

Further, the base station 610 may transmit a message including the system information based on the plurality of redundancy versions in at least one period of time preconfigured as a period of time for transmitting the system information. Accordingly, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 can acquire system information even when only one of a plurality of redundancy versions of a message including the system information is successfully received.

Meanwhile, in the communication network according to an embodiment of the present invention, the base station 610 may configure a plurality of time periods via which system information is transmitted. In this case, the base station 610 may configure a plurality of time periods based on a predetermined periodicity. That is, a plurality of time periods may be periodically configured based on a predetermined periodicity. Here, the base station 610 may transmit a message including system information based on a plurality of redundancy versions in each of a plurality of time periods.

For example, the base station 610 can transmit a message including system information based on a first redundancy version in a first time period of the plurality of time periods. Further, the base station 610 may transmit a message including system information based on a second redundancy version different from the first redundancy version in a second time period (which is a time period after the first time period) among the plurality of time periods. That is, the base station 610 may transmit a message including system information based on different redundancy versions over multiple time periods.

Fig. 10 is a conceptual diagram illustrating a fifth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 10, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information and a first group 620-1 consisting of at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to fig. 6 and 7.

First, each of the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may generate a message requesting system information and transmit the message requesting system information to the base station 610 at a time point pre-configured as a system information requestable time point. At this time, among a plurality of terminals included in the communication network, there may be a terminal (e.g., terminal 620-3) that fails to request system information at a pre-configured point in time. Meanwhile, the message requesting system information is transmitted at a preconfigured time point, which may mean that the system information requestable time point is configured in advance by the base station 610 and that information on the preconfigured time point is obtained from the base station 610.

Accordingly, the base station 610 may receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point pre-configured as a system information requestable time point. Then, the base station 610 may generate a message including the system information and transmit the message to the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point pre-configured as a system information requestable time point.

Here, although the terminal 620-3 fails to request the system information from the base station 610, the terminal 620-3 may receive a message including the system information from the base station 610 if information on a point in time at which the message including the system information is transmitted is obtained in advance. In the above manner, in the communication network, a terminal that fails to request system information from the base station 610 may also receive a message including the system information from the base station 610.

Fig. 11 is a conceptual diagram illustrating a sixth embodiment of an operation method of a communication node for transmitting system information in a communication network according to an embodiment of the present invention.

Referring to fig. 11, a communication network according to an embodiment of the present invention may include a base station 610 transmitting system information and a first group 620-1 consisting of at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to fig. 6 and 7.

First, each of the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may generate a message requesting system information and transmit the message requesting system information to the base station 610 at a time point pre-configured as a system information requestable time point. Here, a scheduling request message transmitted through the PUCCH, which is an uplink control channel, may be used as a message requesting system information at a pre-configured time point. That is, the system information requested at the preconfigured time point may be requested through a scheduling request message through a PUCCH that is an uplink control channel.

Accordingly, the base station 610 may receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point pre-configured as a system information requestable time point. At this time, among a plurality of terminals included in the communication network, there may be a terminal (e.g., terminal 620-3) that fails to request system information at a pre-configured point in time. The terminal 620-3 failing to request the system information may request the system information at an arbitrary time point that is not a system information requestable time point. For example, in the case where system information is requested at an arbitrary time point that is not a system information requestable time point, a terminal that fails to request system information may transmit a message requesting system information in a piggyback (piggyback) manner through a PUSCH as an uplink data channel.

Accordingly, the base station 610 may receive a message requesting system information from a terminal that cannot request system information. Then, the base station 610 may generate a message including the system information and transmit the message to the first, second, and

third terminals

621, 622, and 623 included in the first group 620-1 and the terminal 620-3 failing to request the system information at a time point that is a time point previously configured to transmit the system information.

In the above manner, in the case where a plurality of terminals included in a communication network transmit a message requesting system information at a preconfigured point in time, each of the plurality of terminals can transmit the message requesting system information to the base station 610 by using a PUCCH which is an uplink control channel. Further, in the case where a plurality of terminals included in the communication network transmit a message requesting system information at an arbitrary point in time, each of the plurality of terminals can transmit the message requesting system information to the base station 610 by using the PUSCH as an uplink data channel.

Meanwhile, the terminal 620-3 failing to request system information in the communication network according to an embodiment of the present invention has been described as requesting system information by using the PUSCH, but the embodiment is not necessarily limited thereto. That is, at least one of a plurality of terminals included in the communication network according to an embodiment of the present invention may transmit a message requesting system information to the base station 610 by using the PUSCH, in addition to the terminal 620-3 failing to request system information.

Fig. 12 is a flowchart illustrating an operation method of a communication node for transmitting system information in a communication network according to another embodiment of the present invention.

Referring to fig. 12, a communication network according to another embodiment of the present invention may be the same as the communication network described with reference to fig. 5. That is, the communication network according to another embodiment of the present invention may refer to an NR communication system supporting communication at frequencies below 6GHz and above 6 GHz. As described above, an operation method for transmitting system information in a communication network according to another embodiment of the present invention may be performed in a base station. That is, a communication node transmitting system information in a communication network according to another embodiment of the present invention may refer to a base station.

First, a base station may receive a message requesting system information from a plurality of groups, each of which includes at least one terminal in a communication network (S1210). Here, the plurality of groups may include: a first group comprising at least one terminal and a second group comprising at least one terminal. Further, the plurality of groups may be distinguished according to system information requestable time points configured for at least one terminal belonging to the respective groups. For example, each of the at least one terminal included in the first group may be a terminal capable of requesting system information at a first point in time and requiring that the first system information may be requested at the first point in time. Further, each of the at least one terminal included in the second group may be a terminal capable of requesting system information at the second point in time and requiring that the second system information may be requested at the second point in time. Here, at least one terminal included in the first group and at least one terminal included in the second group may be the same as or different from each other.

That is, the message requesting the system information is transmitted at a preconfigured point in time, which may mean that the system information requestable point in time is configured in advance by the base station 610, and that information on the preconfigured point in time is obtained from the base station 610 by a plurality of terminals included in the communication network. For example, the base station may pre-configure a first time point for requesting first system information and a second time point for requesting second system information. Then, the base station may transmit information on a time point pre-configured for requesting system information (i.e., information on a system information request time) to a plurality of terminals included in the communication network in advance.

Further, resources used for transmitting a message requesting system information may be pre-configured by the base station, and information on the pre-configured resources may be transmitted to a plurality of terminals included in the communication network in advance. For example, a resource used to transmit a message requesting system information may be a RACH preamble, and information on a pre-configured resource may be transmitted together with information on a time point pre-configured for requesting system information.

Specifically, in a case where a first time point for requesting first system information and a second time point for requesting second system information are configured to be the same, the base station may configure a RACH preamble used for requesting the first system information and a second RACH preamble used for requesting the second system information to be different from each other. Further, in the case where a first time point for requesting first system information and a second time point for requesting second system information are configured to be different, the base station may configure a RACH preamble used for requesting the first system information and a second RACH preamble used for requesting the second system information to be identical to each other. Accordingly, a message requesting system information from a plurality of groups may be received based on information regarding a preconfigured point in time and information regarding resources for requesting system information.

Then, the base station may configure a plurality of parameters for transmitting system information for each of the plurality of groups (S1220). The plurality of parameters configured by the base station may include: at least one identifier used to transmit the system information and at least one transmission time to transmit the system information. Here, the identifier may be an SI-RNTI used to transmit system information. Specifically, the base station may configure a transmission time and an identifier for first system information for a first group and second system information for a second group so that the first system information and the second system information may be distinguished from each other.

For example, in a case where the transmission time of the first system information and the transmission time of the second system information are configured to be the same, the base station may configure the identifier of the first system information and the identifier of the second system information to be different from each other. On the other hand, in the case where the transmission time of the first system information and the transmission time of the second system information are configured to be different from each other, the base station may configure the identifier of the first system information and the identifier of the second system information to be the same.

Thereafter, the base station may transmit a message including system information for a plurality of groups based on the configured parameters (S1230). Specifically, in a case where the transmission time of the first system information and the transmission time of the second system information are configured to be the same, the base station may generate messages respectively including the first system information and the second system information having different identifiers, and transmit the generated messages. On the other hand, in a case where the transmission time of the first system information and the transmission time of the second system information are configured to be different from each other, the base station may generate messages respectively including the first system information and the second system information having the same identifier, and transmit the generated messages.

Accordingly, at least one terminal included in each of the plurality of groups may receive a message including system information transmitted from the base station. Here, in the case where a transmission time for first system information of a first group and a transmission time for second system information of a second group are configured to be the same, the base station may monitor the SI-RNTI used for transmission of the system information, thereby identifying the system information.

In the communication network according to another embodiment of the present invention described with reference to fig. 12, the base station transmitting the system information has been described to configure a transmission time of the system information after receiving a message requesting the system information from a plurality of groups. However, the embodiments are not limited thereto. That is, the base station may also configure information on system information transmission time (e.g., information on whether the transmission time of the system information is the same) and transmit the information on the transmission time to the plurality of terminals before receiving a message requesting the system information from the plurality of terminals. Hereinafter, an embodiment of transmitting system information at different transmission times in the operation method described with reference to fig. 12 will be described in more detail with reference to fig. 13.

Referring to fig. 13, a communication network according to another embodiment of the present invention may be the same as the communication network described with reference to fig. 8. That is, a communication network according to another embodiment of the present invention may include: a base station 610 transmitting system information, and a first group 620-1 and a second group 620-2, each of the first group 620-1 and the second group 620-2 being composed of at least one terminal. For example, the first group 620-1 may include the first terminal 621, the second terminal 622, and the third terminal 623 described with reference to fig. 6 and 7. In addition, the second group 620-2 may include a fourth terminal 624, a fifth terminal 625, a sixth terminal 626 and a seventh terminal 627 as described with reference to fig. 6 and 7. Although at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 are described differently, the embodiment is not limited thereto. That is, at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 may be the same terminal, or a part of the groups may be the same.

That is, at least one terminal included in the first group 620-1 may be in a state of previously acquiring information on a pre-configured first time point capable of requesting the first system information, and may be a terminal requiring the first system information. Further, at least one terminal included in the second group 620-2 may be in a state of previously acquiring information on a preconfigured second time point capable of requesting second system information, and may be a terminal requiring the second system information.

First, the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 may generate a message requesting first system information and transmit the message to the base station 610 at a first time point pre-configured as a system information requestable time point. That is, the transmission of the message requesting the first system information at the preconfigured first time point may mean that the first time point is a system information requestable time point configured in advance by the base station 610, and that information on the preconfigured first time point is obtained from the base station 610.

Accordingly, the base station 610 may receive messages requesting system information from the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a first time point pre-configured as a system information requestable time point. Then, the base station 610 may generate a message including the first system information and transmit the message to the first terminal 621, the second terminal 622, and the third terminal 623 included in the first group 620-1 at a time point that is a time point previously configured to transmit the first system information.

seventh terminals

624, 625, 626 and 627 included in the second group 620-2 at a second point in time preconfigured as a system information requestable point in time, and transmit a message including second system information to the fourth, fifth, sixth and

seventh terminals

624, 625, 626 and 627 included in the second group 620-2 at a point in time preconfigured as a point in time for transmitting second system information.

Here, since at least one terminal included in the first group 620-1 and at least one terminal included in the second group 620-2 have different system information request time points, a RACH preamble, which is a resource used to request first system information, and a RACH preamble, which is a resource used to request second system information, may be identical to each other. Further, since a time point of transmitting the first system information and a time point of transmitting the second system information are different from each other, the base station 610 may configure an identifier used to transmit the first system information and an identifier used to transmit the second system information to be identical to each other.

Embodiments of the present disclosure may be implemented as program instructions executable by various computers and recorded on computer-readable media. The computer readable medium may include program instructions, data files, data structures, or a combination thereof. The program instructions recorded on the computer-readable medium may be specially designed and configured for the present disclosure, or may be well known and available to those skilled in the computer software art.

Examples of computer readable media may include hardware devices such as ROM, RAM, and flash memory, which are particularly configured to store and execute program instructions. Examples of program instructions include both machine code, such as formed by a compiler, and high-level language code that may be executed by the computer using an interpreter. The above exemplary hardware devices may be configured to operate as at least one software module in order to perform embodiments of the present disclosure, and vice versa.

Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the disclosure.

Claims

1. A method performed in a terminal for receiving system information, the method comprising:

receiving first minimum system information from a base station;

requesting system information other than the first minimum system information from the base station via a Physical Random Access Channel (PRACH) according to one of at least one system information request time indicated by the first minimum system information; and

receiving the requested system information from the base station according to the system information transmission time indicated by the first minimum system information,

wherein when the at least one system information request time includes two or more system information request times, a first system information request time among the two or more system information request times is for requesting first system information, and a second system information request time among the two or more system information request times is for requesting second system information.

2. The method of claim 1, wherein the at least one system information request time comprises a point in time when the system information other than the first minimum system information is allowed to be requested.

3. The method of claim 1, further comprising receiving information from the base station regarding a contention-free PRACH preamble allowed to be used in the request for system information.

4. A method performed in a base station for transmitting system information, the method comprising:

sending the first minimum system information to a terminal;

receiving a request for system information other than the first minimum system information from the terminal via a Physical Random Access Channel (PRACH) according to one of at least one system information request time indicated by the first minimum system information; and

transmitting the requested system information to the terminal according to the system information transmission time indicated by the first minimum system information,

5. The method of claim 4, wherein the at least one system information request time comprises a point in time when the system information other than the first minimum system information is allowed to be requested.

6. The method of claim 4, further comprising sending information to the terminal regarding contention-free PRACH preambles allowed to be used in the reception of the request.